I am having difficulty understanding how this data collector is collecting data. I want to set my own limits but it appears to be taking several samples per collection and auto ranging the data.
In my “Data Collection set up” I appear to be able to set my Lines of Resolution (LOR) by clicking the drop down menu and selecting 1600 from the field “Resolution”.
To set my Fmax It appears I have to enter the “vibration location” and edit the “vibration readings” tab. The default set up is “Low Range” = 300 Hz “High Range” – 8000 Hz and Demod = 600 Hz. My Time waveform shows 5 seconds of data.
My Low range FFT’s goes out to 12X and High range goes to 300X. In this example my RPM is set at 1705.
If T= LOR/Fmax then it appears to be using the “Low Range” setting of 300 Hz and giving me 5 seconds of data. If I only want to look at a handful of revolutions on the Time waveform I have to zoom into .2 seconds or so. The data is too course this low.
I have to trick the collector and set the “Low Range” to 8000 Hz to get a pretty .2 Second time waveform, but then my FFT plots are off the chart (300X on the low range and 600x (17 kHz) on the high range.
So What I have to do is duplicate every machine and collect data as normal (to view the FFT and a useless TW) and then do it again with a “trick” set of parameters to get a nice Time Waveform (and useless FFT) picture. I am doubling the data, and collection points to try and get what I want.
Am I doing something wrong? Is there some way I can set this thing to give me the Time Waveform I desire?
I’m sorry for the long winded post to ask such a direct question, but writing it out really helped me understand the problem here. Much Thanks in advance,